How to Winterize and Store a Robot Mower (2026 Guide)

How to winterize and store a robot mower

Short answer: clean the mower thoroughly, fit a fresh set of blades and screws, fully charge the battery, then store the unit and its charging station indoors somewhere dry and above freezing (above 32°F). Most modern mowers don't need any mid-winter charging — just a full charge before you power it off. Done right, winterizing takes under an hour and means the mower starts the first warm week of spring like nothing happened.

For context on how we cover maintenance: MowScout is spec-verified and data-driven, not a hands-on test lab, so the steps below come from manufacturer guidance — primarily Husqvarna's official winter-storage page — with sources linked.

When to winterize

Pull the mower for the season once active grass growth stops and overnight temperatures start dipping toward freezing — in most of the US that's late fall, though it varies by region. Before that final run, Husqvarna suggests leaving the lawn a touch longer for winter, around 6–8 cm (about 2.4–3.1 inches), per its storage guide. A slightly longer winter canopy protects the crown of the grass.

Don't wait for the first hard freeze with the mower still parked outside on its dock — the goal is to get it cleaned and indoors before the freeze-thaw cycles start.

Step 1: Clean it properly

A clean mower stored dry is the whole ballgame for preventing corrosion. Husqvarna's guidance is to clean the body, chassis, and blade disc, and remove all grass clippings and debris from moving parts, per the winter-storage page.

• Brush packed clippings off the underside, the cutting disc, and the wheels.
• Wipe down the housing; let everything dry fully before storage.
• Wipe the charging contacts on the mower and dock so they don't oxidize over the winter.
• Avoid blasting it with a high-pressure washer, which can force water into bearings and electronics — a soft brush and damp cloth are safer.

Step 2: Fit fresh blades and inspect

This is the one job people skip and regret. Husqvarna recommends installing new blades and screws before storage so the mower is sharp and ready in spring and the disc doesn't sit with worn parts all winter, per the same guide. It's also the natural moment to:

• Inspect the wheels, body, and cover for cracks or wear, especially wheel bearings.
• Note anything that needs a part so you can order it over the off-season rather than scrambling in spring.

(See our blade-replacement guide for the step-by-step and the always-use-new-screws rule.)

Step 3: Charge, then power down

Lithium-ion batteries store best with a healthy charge — not bone-empty.

• Fully charge the battery, then switch the mower off, per Husqvarna.
• Most models need no mid-winter charging. Husqvarna notes that for most current models, a full charge before power-off is enough; some older models want a top-up roughly every three months, so check your operator's manual.
• Never store a mower on a dead battery — a deeply discharged lithium pack sitting cold for months can be permanently damaged.

Step 4: Store it indoors, above freezing

Where you put it matters as much as how you prep it.

• Indoors, dry, above 0°C / 32°F — Husqvarna's explicit requirement on the storage page. A heated garage, basement, or utility room is ideal; an unheated shed that drops below freezing is not.
• Rest it on all wheels on a flat surface, or hang it on the manufacturer's wall bracket.
• Bring the charging station in too. Disconnect it and store it in a dry, frost-free spot. Some models (Husqvarna's NERA line, for example) only need the top section indoors while the baseplate can stay out — check your manual.
• For wire-free RTK mowers like the Mammotion Luba 3 AWD or a Navimow, bring the RTK reference antenna and dock indoors as well; that's where the expensive electronics live.

A bonus benefit: storing the mower inside removes it as a winter theft target. A mower sitting on a dock in an empty yard for months is exactly what opportunists look for.

Why above-freezing storage matters

It's worth understanding why manufacturers insist on a dry, above-freezing spot, because it's about the battery as much as the housing. Robot mowers use lithium-ion packs, and three cold-weather effects are what you're guarding against:

• Charging in the cold damages cells. Lithium-ion batteries should not be charged below freezing; doing so can permanently degrade capacity. Storing the mower powered-off and indoors sidesteps any accidental cold charging.
• Deep discharge plus cold is the killer. A pack left nearly empty for months in the cold can drift below the voltage it can recover from. That's exactly why the guidance is to store it fully charged, not empty.
• Condensation corrodes contacts. A mower that swings between freezing nights and warmer days in an unheated shed collects moisture, which oxidizes the charging contacts and stresses the electronics. A stable, dry, above-freezing room avoids that cycle.

In short: full charge, powered off, dry, above 32°F. Get those four right and the battery comes out of winter essentially where it went in.

Do's and don'ts

Husqvarna also suggests writing down each charging station's position and the mower's serial number before storage, which makes spring reinstallation painless, and the trade publication Landscape Management echoes the same clean-charge-store fundamentals in its winterization do's and don'ts.

Bringing it back in spring

Reverse the process: reinstall the dock and (for RTK) the antenna in the same spot you noted, charge the mower fully, update the app and firmware, and do a slow first run to confirm the map and boundaries still hold. If you stored fresh blades on it, you're already set for the first cut.

FAQ

Do I need to charge my robot mower over the winter? For most modern models, no — Husqvarna's guidance is to fully charge the battery, then power the mower off and store it; no mid-winter charging needed. Some older models do want a top-up every three months, so check your operator's manual. Either way, never store it on a dead battery.

What temperature should I store a robot mower at? Indoors, in a dry place that stays above freezing — Husqvarna specifies above 0°C / 32°F. Cold itself won't destroy a lithium battery, but storing and especially charging at sub-freezing temperatures shortens its life, and a damp shed invites corrosion on the contacts and electronics.

Should I bring the charging station inside for winter too? Generally yes. Husqvarna says to disconnect the charging station and store it in a dry, frost-free spot (with some model exceptions where only the top section needs to come in). For wire-free RTK mowers, bring the reference antenna and dock indoors as well to protect the electronics.

Can I leave my robot mower outside all winter? It's not recommended. Freeze-thaw moisture, ice, and salt corrode contacts and stress the battery and electronics, and a mower left in the open is an easy theft target. The standard advice across manufacturers is to clean it, charge it, and store it indoors above freezing.

Buying for a four-season climate?

If you're in a cold-winter region, storage and battery care are worth weighing before you buy — alongside slope and navigation fit. Our configurator factors your conditions in and shows the models that suit your yard.

Find your robot mower → the 60-second configurator